Liem proposed an exploration–explanation activity, “The bottle and the bag,” related to atmospheric pressure. Young students had to (1) find out that it is not possible to take the bag out of the bottle, and (2) explain what is holding the bag inside the bottle.

1.
T. L.
Liem
,
Invitation to Science Inquiry
, 2nd ed. (
Ginn Press
,
Lexington, MA
,
1987
), p.
6
.
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